WHi-Wil 



b. Embryological development. Heptcanchias spec, Hexanchus spec. (No- 

 tidanidae, Selachii) 



c. Development of the pelvic girdle. (Anura) 



WHITTAKER, J. R. B.A., M.Sc, Ph.D. — Dept. of ZooL, Univ. of Cali- 

 fornia. LOS ANGELES 24. Calif., U.S.A. 



a. Biochemical analysis of differentiation and metaplasia of embryonic eye 

 tissues cultured in vitro. Gallus domesticus (Aves) 



b. Melanin biosynthesis and cell regulatory mechanisms in differentiating 

 pigment cells. Ciona intestinalis, Styela spec. (Ascidiae). Gallus domes- 

 ticus (Aves) 



c. Charaterization of specific gene expression by primary and established 

 cell cultures. 



WIDERSTEN, B. Fil.mag. — Zool. Inst., Univ. of Uppsala, UPPSALA. 



Sweden 

 a. Larval development. (Scyphozoa) 

 WIERTZ (HOESSELS). Mrs. E. L. M. J. Ph.D. — Veter. Anat. and 



Embryol. Inst., State Univ. of Utrecht, Bekkerstr. 141, UTRECHT. 



Netherlands 



a. Photographical series of normal development. Gallus domesticus (Aves) 



b. Photographical series of organ development. Domestic animals (Mam- 

 malia) 



c. Histochemical determinations in embryos. Domestic animals (Mammalia) 



d. Development of peripheral vegetative nervous system. Domestic animals 

 (Mammalia) 



WIGGLESWORTH, V. B. Dr., M.I.I.E., Prof. — Dept. of Zool., Univ. of 



Cambridge. Downing St., CAMBRIDGE, England 

 a. Mode of action of growth hormones. Rhodnius prolixus (Triatomidae, 



Hemiptera) 

 WILD, A. E. B.Sc. Ph.D. — A.R.C. Unit of Embryol., Dept. of Zool., Univ. 



Coll. of North Wales, BANGOR. Caernarvonshire, Wales 

 a. Protein composition of the maternal and foetal fluids at different stages 



of pregnancy. Oryctolagus cuniculus (Lagomorpha) 

 WILDE. C. E., Jr. A.B., M.A., Ph.D., M.I.I.E., Prof. — Dept. of Histol. and 



Embryol., School of Dental Med., Univ. of Pennsylvania, 4001 Spruce 



St. PHILADELPHIA. Pa. 19104, U.S.A. 



a. Organogenesis in vitro (limb bud, gills, cranial neural crest). Am- 

 bystoma maculatum (Urodela) 



b. Cellular differentiation (pigment cell; ectomesenchyme). Ambystoma 

 maculatum (Urodela) 



1 . causal biochemistry of cellular differentiation. 



2. differentiation of cytoplasmic fragments. 



c. Morphology and causal biochemistry of striated muscle differentiation. 

 Ambystoma maculatum (Urodela) 



d. Electrophoresis of molecular constituents of specific embryonic anlagen 

 and cell types; fraction recovery and tissue culture of embryonic cells in 

 the presence of selected fractions. Ambystoma maculatum (Urodela) 



e. Cytochimeras in tissue culture from disaggregated cells of embryos of 

 different classes. Gallus spec. (Aves) , Mus spec. (Rodentia) 



f. Role of probablistic processes in cellular differentiation. Gallus spec. 

 (Aves), Mus spec. (Rodentia) 



218 



